Last updated: June 11, 2026
Clinical Trial Registration
Any research study (clinical trial) that prospectively assigns human participants or groups of humans to one or more health-related interventions to evaluate the effects on health outcomes must be registered. Prospective clinical trials should be registered in a publicly accessible registry before enrollment of the first participant. Retrospective registration may be considered only in exceptional circumstances and must be clearly explained by the authors. This registration policy applies to prospective/randomized/controlled trials only. Authors must provide the registration identification number and the URL for the trial's registry.
Sample wording: This study is registered at [URL]. The registration identification number is [registration identification number].
Some registries are listed below:
United States National Library of Medicine
International Standard Randomized Controlled Trial Number Registry
European Clinical Trials Database
Please click on the links below to download the sample documents of clinical trial registration statement: